NIST 800-53 REV 5 • INCIDENT RESPONSE
IR-4(8) — Correlation with External Organizations
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Supplemental Guidance
The coordination of incident information with external organizations—including mission or business partners, military or coalition partners, customers, and developers—can provide significant benefits. Cross-organizational coordination can serve as an important risk management capability. This capability allows organizations to leverage information from a variety of sources to effectively respond to incidents and breaches that could potentially affect the organization’s operations, assets, and individuals.
Practitioner Notes
Some incidents affect more than just your organization — they may involve shared infrastructure, supply chain partners, or industry-wide attacks. This enhancement requires coordination with external organizations to share incident information.
Example 1: Join an Information Sharing and Analysis Center (ISAC) relevant to your industry — the Defense Industrial Base ISAC (DIB-ISAC) for defense contractors or Health-ISAC for healthcare. Share and receive threat indicators through their platforms.
Example 2: Establish a memorandum of understanding (MOU) with key partners and vendors for incident information sharing. When an incident involves a shared service or vendor, use the MOU framework to coordinate response and share IOCs, timelines, and remediation steps.